twa breakage on AMD64 with 9.1.5.2 3ware version and 2005-01-1103:00:49 UTC RELENG_5 commit

[Michael Meltzer]

The new 3ware twa drive does not seem to work after the 2005-01-11 
03:00:49 UTC RELENG_5 commit.  Basically the device da is not visible  
to complete the boot and the system stopped asking for the root path (if 
their was an error message it scrolled to fast for me to see) Backed off 
to 5_3_0_RELEASE code to /usr/src/sys/dev/twa/* to get the system 
backup. FWIW the 3ware support page does NOT list amd64 freebsd support 
for this driver( 9.1.5.2) and 3ware seem to define the downloadable 
driver firmware feather in their makefile, the -D rule does not seem to 
have made it to the build. I tried to rebuild the code with the correct 
define but the firmware try to load but still had the problem. Took a 
look at the CVS diffs but it a large/complex change set and someone 
smarter than myself needs to take a look. -mjm